Window-spring.



' G. E. AVERY.

WINDOW SPRING.

APPLICATION FILED APR. 12, 1904.

no MODEL.

PATENTBD NOV. 8, 1904.

.INVENTOR- I 6% ATTOR N EY UNITED STATES Patented November 8, 1904.

PATENT OFFICEI CHARLES E. AVERY, OF JERSEY CITY, NEW JERSEY, ASSIGNOR TO MANHATTAN ELECTRICAL SUPPLY COMPANY, A CORPORATION OF NEW JERSEY.

WINDOW-SPRING.

SPECIFICATION forming part of Letters Patent No. 774,463, dated November 8, 1904. Application filed April 12, 1904. Serial No. 202,805. (No model.)

To all whom, it may concern.-

Be it known that I, CHARLEs E. AVERY, a citizen of the United States, and a resident of Jersey City, Hudson county, New Jersey, have invented certain new and useful Improvements in Window-Springs, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to that class of circuitclosing devices which are employed in burglar-alarm systems and are popularly known as window-springs, because they are adapted to be operated to sound an alarm upon the surreptitious opening of a window or other movable object; and my invention comprises a window-spring consisting of the main contacts, which are actuated or controlled by the movement of the window, and having an auxiliary-contact device by means of which the main contacts may be disconnected from the circuit to enable the location of a defective or inoperative spring to be readily determined and by which they will be automatically reconnected to the circuit by the return movement of the sash or equivalent object.

In the drawings which illustrate a form of window-spring to which my invention has been applied, Figure 1 is a sectional elevation of the spring arranged in a window-frame with the sash closed; and Fig. 2 is an elevation thereof, showing the sash open or raised and the main contacts closed.

Similar reference characters are employed to designate like parts in all the views.

The particular form of window spring which I have selected for descriptive purposes comprises a plate 1, which is adapted to be secured in a recess of the window-frame. A contact-arm 2 is pivoted in the slot 3 of the plate and is provided with an elbow 4. A

' spring 6, which bears against the arm 2, tends to hold it in the position shown in Fig. l. A recess 7 is formed in the side of the windowsash A, so that when the window is in its normal or closed position the elbow 4 will proj ect into the recess, but when the sash is raised the recess will be carried above the elbow and will force arm 2 into contact with the tongue 8, as shown in Fig. 2.

The tongue 8 is secured to the plate 1 by the eyelet 10, which is insulated from the plate and the spring 6 by the non-conducting washers 11. A binding-post 12, to which one of the circuit-wires is connnected, is also secured to the plate in contact with the tongue 8 by the eyelet 10. The other circuit-wire is connected to a binding-post 15, which is secured to the plate 1 by the eyelet 16. Washers 17 insulate the binding-post 15 from the plate.

A spring-arm 20 is clamped to the bindingpost 15 in metallic contact therewith, but insulated from the plate, and a cam 21 is pivoted in the slot 3. The cam 21 is provided with a toe 22, Fig. 2, and when the cam is pressed inwardly the end of the spring-arm 20, as shown in Fig. 1, will exert sufficient pressure against the toe to hold the cam in place, although it may be readily disengaged so as to fall into the position shown in Fig. 2 by inserting any pointed instrument behind the projection 24, formed on the cam.

All the parts of the device described are of conducting metal except the insulating-washers, and it will be seen that with the parts in the position shown in Fig. 1 one terminal of the circuit is formed by the tongue 8, while the other terminal is formed by the arm 2, which is in connection with the line through the plate 1, cam 21, arm 20, and binding-post 15, so that when the sash is raised, pressing the arm 2 into contact with tongue 8, the circuit will be closed through the main contacts 2 and 8. By swinging the cam 21 to disengage the arm 20, as shown in Fig. 2, the circuit will be broken through these auxiliary contacts. 7

The spring is secured to the window-frame B by screws 25, passing through the eyelets 10 and 16.

It often happens in systems equipped with window-springs that the main contacts fail to operate properly to open the circuit when the window is closed. In locating such a defective or inoperative spring the spring is disconnected from the circuit by swinging the cam 21 out of engagement with the arm 20, thus breaking the circuit at that point, and when the window is closed the lower edge of the sash will engage with the cam and swing it back into engagement with the arm 20, thus automatically closing the circuit and rendering it impossible to close the window without reconnecting the spring to the line.

Having thus shown and described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A window-spring provided with main contacts and with auxiliary contacts for controlling the circuit through the main contacts and arranged to be closed by the movement of the window.

2. In a window-spring, main contacts controlled by the movement of the sash and auxiliary contacts free from the control of the sash for breaking the circuit to the main contacts but movable by the sash to close said circuit.

3. In a window-spring the combination of a plate, main contacts, controlled by the movement of the sash, carried by the plate, and a pivoted cam movable into the path of the sash to break the circuit to the main contacts.

4. 1n a window-spring the combination of a plate, main contacts carried thereby, an auxiliary spring contact-arm carried by the plate and a pivoted cam engaging said arm and movable out of engagement therewith into the path of the sash.

CHARLES E. AVERY.

Witnesses:

ROBT. B. KILLGORE, O. H. Horwooi). 

